Morse Sounder Glassware_Glass Bottles or Meker burners

or Meker burners

each foam-protected in a wooden case with frequencies labeled

NPN transistor in a protective enclosure with labeled base

Entry-level two-part human skull model separates the skull cap to reveal the cranial cavity for introductory head-anatomy teaching at secondary and college levels

the larger geometry pushing pole separation wide enough that field lines extend visibly beyond the magnet body for filing maps

Morse Sounder Glassware_Glass Bottles or Meker burnersUsed to receive Morse code signals as audible clicks, this electromagnet driven pivoted arm sounder on a wooden base produces the snap of early telegraph operation when current pulses the coil.